실리콘/클래이의 열분석

초록

Difunctional hydroxyl-terminated poly(dimethylsiloxane) (PDMS) was used to synthesize end-linked networks in bulk state. Silicone rubber cured with PDMS, tetrafunctional cross-linkers and tetrapropyl orthosilicate (TPOS) Γ-aminopropyl triethoxy silane (APTES) was added to introduce amine groups to the silicone rubber. In addition, the silicone rubber was compounded with Cloisite？25A(C25A), C20A and C30B. Higher degree of exfoliation of the silicate layers was obtained in all of ! the silicone/clay composites. The kinetics of the thermal degradation and thermal stability of the silicone rubber and its composites with C25A, C20A and C30B was studied by the thermogravimetric analysis under a nitrogen atmosphere at different heating rate. The activation energy for the thermal degradation was determined by way of the Flynn-Wall-Ozawa’s method and the Kissinger one. The measured activation energy of the silicone/clay composites indicated that the composites with exfoliated clay platelets was more thermally stable than that of the pristine silicone rubber.